X-rays are used in a variety of places, from doctors' offices to airport checkpoints. Although the medical scans help doctors and patients around the world, they're not without risks. Here are five things to know about X-ray radiation. See more »

Hallucinogens have a reputation for expanding your mind. Is it warranted? Science says that a little psilocybin (or mescaline or MDMA) might be able to cure what ails you -- even addiction to drugs like heroin and meth. See more »

Diuretics stop working for many people with advanced heart failure, so scientists developed a procedure known as ultrafiltration. The UNLOAD study compared the safety and efficacy of ultrafiltration with that of diuretic drugs. What did they find? See more »

The American Heart Association estimates that about 5 million people nationwide have heart failure and the cost of treatment in 2008 rose to $35 billion. Why does a disease with no cure cost so much money? See more »